Philippines. National Mapping and Resource Information Authority. (1988). Laoag. National Mapping and Resource Information Authority.
芝加哥风格引文Philippines. National Mapping and Resource Information Authority. Laoag. Makati [Metro Manila]: National Mapping and Resource Information Authority, 1988.
MLA引文Philippines. National Mapping and Resource Information Authority. Laoag. National Mapping and Resource Information Authority, 1988.
警告：这些引文格式不一定是100％准确.